---
title: "Leaky Gut: Why Your Gut Barrier Matters More Than You Think"
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markdown_url: "https://www.andreaproulxnd.com/llms/blog/leaky-gut-why-your-gut-barrier-matters-more-than-you-think"
lastmod: "2025-04-11T00:14:59.000Z"
---

You’ve probably heard the term “leaky gut” tossed around in wellness circles, but you want more than buzzwords. You want facts and science. So here it is: leaky gut, or increased intestinal permeability, is when the tight junctions in your intestinal lining lose their integrity, allowing unwanted substances—like bacteria, toxins, and food particles—to slip into the bloodstream (where they don’t belong).

## 🚧 What Causes Leaky Gut?

Let’s start with the science-backed culprits:

- Processed food additives like carboxymethylcellulose, polysorbate 80, and carrageenan, artificial colours and flavours, emulsifiers.. the list goes on
- Chronic stress (hello cortisol) from life and exercise
- Overuse of NSAIDs and antibiotics like ibuprofen – yikes!
- Dysbiosis (imbalance in gut microbiota)
- Alcohol (even in those post-race “earned it” glasses of wine)
- Nutrient deficiencies, especially zinc and vitamin D
- Strenuous or excessive endurance exercise (yep, more on that below)

## 💪 Leaky Gut Meets Exercise

Here’s where it gets personal. As someone who trains, teaches, or coaches others through movement, your gut barrier literally supports your performance.

•	Heat + high intensity = barrier stress: Prolonged, intense exercise (especially in heat) can reduce blood flow to the gut and increase gut permeability.

•	GI distress: runners poops, bloating, nausea – hello my endurance athletes and multi-game tournament players!

•	Malabsorption of nutrients: If your gut lining is compromised, you're not fully absorbing the micronutrients that fuel recovery and mitochondrial health.

## 🔁 Hormones + The Gut Connection

 Leaky gut = inflammation = hormone disruption. Chronic low-grade inflammation can interfere with HPA axis function, which directly impacts cortisol from the adrenal glands, thyroid hormones, and reproductive hormones.

Estrogen metabolism depends on a healthy microbiome (hello estrobolome). Gut dysfunction can lead to estrogen dominance symptoms, PMS, irregular cycles, or perimenopausal chaos.

## 🧘‍♀️ What You Can Do

•	Prioritize gut-friendly whole foods and reduce ultra-processed intake.

•	Limit emulsifiers and artificial sweeteners in your daily protein shakes and snacks.

•	Support the microbiome with fiber diversity, fermented foods, and targeted probiotics.

•	Be strategic with training load and support recovery—your gut lining regenerates during rest.

Bottom line: Your gut isn't just digesting your kale salad—it's shaping your recovery, energy, and hormonal rhythm. Keep the barrier strong, and the rest follows.

And know you’re not alone! Get the right science-based knowledge, get your blood tested for deficiencies and speak to a naturopathic doctor about what nutrition and supplements are right for you. Don’t make this a guessing game! You deserve more from your performance in sport and life!

## References

- Food-grade carrageenans and their implications in health and disease  Fang Liu. 2021. PMID 34146449
- Food Emulsifiers and Metabolic Syndrome: The Role of the Gut Microbiota. Martina De Siena. 2022. PMID 35892789
- Is There an Exercise-Intensity Threshold Capable of Avoiding the Leaky Gut? Filipe M Ribeiro 2021. PMID: 33763441
- Exercise-induced stress behavior, gut-microbiota-brain axis and diet: a systematic review for athletes. Allison Clark. 2016. PMID: 27924137